[Review of surgical treatment of suprastomal collapse in tracheostomised children].

Background: Suprastomal collapse (SSC) is considered a major late complication of paediatric tracheostomy and can be responsible for decannulation failure in up to 20% of tracheostomised children. Depending on the severity of SSC, surgery may be required. Various strategies and techniques are available, of which the treating with airway team should be aware.

[Impact of benign parotid gland tumors on whole salivary flow rate].

Objective: The impact of benign tumors of the parotid gland on whole salivary flow or sialochemistry is unclear.

Material And Methods: A total of 22 patients with benign parotid tumors and 18 healthy controls underwent measurements of unstimulated and stimulated whole saliva flow and sialochemistry (Na+, K+, Ca++, Amylase, and pH). Assessment of xerostomia was performed by means of a visual analogue scale (VAS) and a questionnaire (QoL).

Investigation of Cellular Function and DNA Integrity during 2D in vitro Culture of Human Salivary Gland Epithelial Cells.

In vitro culture of human salivary gland epithelial cells (SGEC) is still a challenge. A high quantity and quality of cells are needed for the cultivation of 3D matrices. Furthermore, it is known that DNA damage is supposed to be an important factor involved in carcinogenesis.

Surgery of the major salivary glands and its impact on salivary flow-A review.

Objective: The aim of this study was to bring attention to a rather unnoted side effect of salivary gland surgery-reduced salivary flow.

Methods: A systematic PubMed, Cochrane Library, LIVIVO, and Embase databases search was performed to identify relevant articles.

Results: Eight studies matched the inclusion criteria.

Time-Dependent Toxic and Genotoxic Effects of Zinc Oxide Nanoparticles after Long-Term and Repetitive Exposure to Human Mesenchymal Stem Cells.

Zinc oxide nanoparticles (ZnO-NP) are widely spread in consumer products. Data about the toxicological characteristics of ZnO-NP is still under controversial discussion. The human skin is the most important organ concerning ZnO-NP exposure.

Development of Human Salivary Gland-Like Tissue In Vitro.

The loss of salivary gland function caused by radiation therapy of the head and neck is a serious condition and it affects a patient's quality of life. The current lack of effective therapies demands new options to be explored. This study tested whether human salivary gland epithelial cells (SGECs) could be successfully cultured on a decellularized porcine gut matrix (SIS-muc) in both mono- and coculture with microvascular endothelial cells (mvECs).

Two-stage autotransplantation of the human submandibular gland: First long-term results.

Objectives/hypothesis: Xerostomia is still one of the predominant side effects of radiotherapy (RT). This study investigates long-term results of a new surgical method that spares the submandibular gland from radiation.

Study Design: Eleven patients with head and neck carcinoma were enrolled in the study.

Two-stage autotransplantation of human submandibular gland: a novel approach to treat postradiogenic xerostomia.

Xerostomia is a persistent side effect of radiotherapy (RT), which severely reduces the quality of life of the patients affected. Besides drug treatment and new irradiation strategies, surgical procedures aim for tissue protection of the submandibular gland. Using a new surgical approach, the submandibular gland was autotransplanted in 6 patients to the patient's forearm for the period of RT and reimplanted into the floor of the mouth 2-3 months after completion of RT.

Complete Genome Sequence of the Urethral Catheter Isolate Myroides sp. A21.

Myroides sp. A21, isolated from a urethral catheterized patient without symptoms of a urinary tract infection in Germany, proved to be extensively drug resistant. Here, we report the 4.

A metaproteomics approach to elucidate host and pathogen protein expression during catheter-associated urinary tract infections (CAUTIs).

Long-term catheterization inevitably leads to a catheter-associated bacteriuria caused by multispecies bacterial biofilms growing on and in the catheters. The overall goal of the presented study was (1) to unravel bacterial community structure and function of such a uropathogenic biofilm and (2) to elucidate the interplay between bacterial virulence and the human immune system within the urine. To this end, a metaproteomics approach combined with in vitro proteomics analyses was employed to investigate both, the pro- and eukaryotic protein inventory.

Vascularization of engineered cartilage constructs in a mouse model.

Tissue engineering of cartilage tissue offers a promising method for reconstructing ear, nose, larynx and trachea defects. However, a lack of sufficient nutrient supply to cartilage constructs limits this procedure. Only a few animal models exist to vascularize the seeded scaffolds.

Nicotine derived genotoxic effects in human primary parotid gland cells as assessed in vitro by comet assay, cytokinesis-block micronucleus test and chromosome aberrations test.

Genotoxic effects of nicotine were described in different human cells including salivary gland cells. Based on the high nicotine concentration in saliva of smokers or patients using therapeutic nicotine patches, the current study was performed to evaluate the genotoxic potential of nicotine in human salivary gland cells. Therefore, primary salivary gland cells from 10 patients undergoing parotid gland surgery were exposed to nicotine concentrations between 1 μM and 1000 μM for 1 h in the absence of exogenous metabolic activation.

Transposon mutagenesis identified chromosomal and plasmid genes essential for adaptation of the marine bacterium Dinoroseobacter shibae to anaerobic conditions.

Anaerobic growth and survival are integral parts of the life cycle of many marine bacteria. To identify genes essential for the anoxic life of Dinoroseobacter shibae, a transposon library was screened for strains impaired in anaerobic denitrifying growth. Transposon insertions in 35 chromosomal and 18 plasmid genes were detected.

Nanoparticle-induced photocatalytic head and neck squamous cell carcinoma cell death is associated with autophagy.

Aim: To characterize molecular mechanisms underlying photocatalytic cell death of head and neck squamous cell carcinoma (HNSCC) by zinc oxide nanoparticles (ZnO-NPs).

Materials & Methods: Human HNSCC-derived FaDu cells were incubated with ZnO-NPs followed by UVA-1 irradiation. Cytotoxicity was assessed by MTT assay and annexin-V propidium iodide test.

Nitrogen dioxide is genotoxic in urban concentrations.

In the discussion on toxic and genotoxic thresholds of air pollutants such as nitrogen dioxide (NO2), realistically low urban concentration ranges are of major interest. For NO2, the WHO defines the annual limit value as corresponding to 0.02 ppm.

Microbial communities related to volatile organic compound emission in automobile air conditioning units.

During operation of mobile air conditioning (MAC) systems in automobiles, malodours can occur. We studied the microbial communities found on contaminated heat exchanger fins of 45 evaporators from car MAC systems which were operated in seven different regions of the world and identified corresponding volatile organic compounds. Collected biofilms were examined by scanning electron microscopy and fluorescent in situ hybridization.

Ex vivo toxicity of nitrogen dioxide in human nasal epithelium at the WHO defined 1-h limit value.

Current pollution limits indicating potential harm to human health caused by nitrogen dioxide have prompted a variety of studies on the cytotoxicity and genotoxicity of nitrogen dioxide (NO₂) in vitro. The present study focuses on toxic effects of NO₂ at the WHO defined 1-h limit value of 200 μg NO₂/m(3) air, equivalent to 0.1 ppm NO₂.

Repetitive exposure to zinc oxide nanoparticles induces dna damage in human nasal mucosa mini organ cultures.

Data on the toxicological properties of zinc oxide nanoparticles (ZnO-NPs) is incomplete. ZnO-NPs may enter humans via inhalation or ingestion. The aim of the current study was to evaluate ZnO-NP-induced genotoxicity in three-dimensional (3D) mini organ cultures (MOCs) of human nasal mucosa following repeated exposure to ZnO-NP and regeneration.

Cytotoxic, genotoxic and pro-inflammatory effects of zinc oxide nanoparticles in human nasal mucosa cells in vitro.

Despite increasing application of zinc oxide nanoparticles (ZnO-NPs) for industrial purposes, data about potential toxic properties is contradictory. The current study focused on the cyto- and genotoxicity of ZnO-NPs in comparison to ZnO powder in primary human nasal mucosa cells cultured in the air-liquid interface. Additionally, IL-8 secretion as a marker for pro-inflammatory effects was measured.

Zinc oxide nanoparticles induce photocatalytic cell death in human head and neck squamous cell carcinoma cell lines in vitro.

The aim of this study was to determine the photocatalytic effects of zinc oxide (ZnO) NPs in combination with UVA-1 in human head and neck squamous cell carcinoma (HNSCC) cell lines in vitro. NP characteristics and intracellular distribution were described by transmission electron microscopy (TEM). After pre-incubation with ZnO NPs in concentrations of 0.

Nanosized titanium dioxide particles do not induce DNA damage in human peripheral blood lymphocytes.

Industrial application of titanium dioxide nanoparticles (TiO(2) -NPs) as an additive in pharmaceutical and cosmetic products is increasing. However, the knowledge about the toxicity of this material is still incomplete and data concerning health and environmental safety and results of recent studies on TiO(2) nanotoxicology are inconsistent. The in vitro geno- and cytotoxicity of TiO(2) -NPs in the anatase crystal phase was evaluated in human peripheral blood lymphocytes from 10 male donors.

Customized tissue engineering for ear reconstruction.

Tissue engineering (TE) of cartilage for reconstructive surgery has proven to be a promising option for obtaining tissue for 3D structures that results in minimal donor site morbidity. Technological advances in this area are important since many defects can only be treated with customized implants. Most TE strategies rely on the use of resorbable 3D scaffolds to guide the growing tissue, with each tissue requiring a specific scaffold that has precisely defined properties depending on the physiological environment.

Aspects of nitrogen dioxide toxicity in environmental urban concentrations in human nasal epithelium.

Cytotoxicity and genotoxicity of nitrogen dioxide (NO(2)) as part of urban exhaust pollution are widely discussed as potential hazards to human health. This study focuses on toxic effects of NO(2) in realistic environmental concentrations with respect to the current limit values in a human target tissue of volatile xenobiotics, the epithelium of the upper aerodigestive tract. Nasal epithelial cells of 10 patients were cultured as an air-liquid interface and exposed to 0.

Intracellular distribution, geno- and cytotoxic effects of nanosized titanium dioxide particles in the anatase crystal phase on human nasal mucosa cells.

Nanomaterials are defined as substances with at least one dimension smaller than 100nm in size and are used for a multitude of purposes. Titanium dioxide nanoparticles (TiO(2)-NPs) are an important material used as an additive in pharmaceutical and cosmetic products. Due to their high surface-to-mass index, TiO(2) nanoparticles show different physical and chemical characteristics compared to the bulk substance.